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Brothers Performance has everything you need to get your 2015 Mustang gears installed correctly. This Mustang rear gear installation kit is a must when installing any new rear ring and pinion set. These kits are also useful to simply replace the worn out parts in the rear carrier housing. Most Ford rear gear installation kits include new pinion seal, ring gear bolts, crush collar, pinion nut, shims, pinion bearing, carrier bearings and all new bearing races, gear marking compound, loctite and gaskets are also included.